Volve data in this folder
=========================

These files are derived from the Volve dataset, published by Equinor ASA (operator)
with the former Volve licence partners (ExxonMobil Exploration & Production Norway AS
and Bayerngas Norge AS), under the Volve Terms and Conditions for the licence to the
data. The terms are based on CC BY 4.0 with two changes: the data may not be sold, and
the licence covers all data in the set whether or not copyright applies.
https://www.equinor.com/energy/volve-data-sharing
Data owners: Equinor (operator) and the former Volve licence partners.

What the terms ask, and how it is met here
- Credit: every figure carries the owners and the terms in its caption; this notice
  links to them.
- Commercial and non-commercial use are allowed. The data shall not be sold.
- Adapted material may be shared, but not under a licence that prevents recipients from
  complying with the terms.
- The data is not presented misleadingly or distorted, and no endorsement by Equinor or
  the former partners is implied.
- Changes are indicated (below).

Changes made to the original data
- Only small derived extracts are included. The 3D SEG-Y volume and the interpretation
  files are NOT included.
- Rings: three circular sections read from the volume (nearest trace, no interpolation),
  amplitudes scaled to 8-bit integers over one clip value.
- Cities: windows of the volume around at most 3,500 picks of each of eight interpreted
  surfaces (every k-th pick), aligned by a matched filter, with summary statistics.
- Growth rings and flow: root-mean-square amplitude of such windows, and the apparent
  dip of one interpreted surface smoothed over 150 m.
- Trace shells: the analytic signal (envelope, phase, instantaneous frequency) of 48
  traces. Fault constellations: a per-pick discontinuity along one interpreted surface,
  with the interpreters' fault polygons for that surface as reference lines. One thread:
  an 80 ms slab of every trace, 8-bit.
- Surface names are read from the interpreters' file names; one abbreviation (BCU, Base
  Cretaceous Unconformity) is expanded from general knowledge, not from the files.
- The vertical domain (time) and quantity (amplitude) are stated by the publisher of
  this gallery, not by the files; polarity is unknown.

Disclaimer (from the dataset licence)
The data are provided on an "as is" basis and may contain errors and omissions. Equinor
and the former Volve licence partners provide no warranties, expressed or implied,
either relating to the content or to the relevance of the data, and are not liable for
any direct or indirect losses as a result of use of the data.